Injection Molding
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HDPE Flow Mark and Jetting
Problem Phenomenon
Flow marks and jetting marks appear on the product surface, especially obvious near the gate
Cause Analysis
Too low HDPE injection speed cools the flow front to form flow marks; too high speed causes gate jetting to form jetting marks; poor gate design makes the melt directly impact the cavity wall; during on-site troubleshooting, verify item by item according to this mechanism to avoid blindly adjusting the machine based solely on experience
Solution
①Optimize injection speed to medium speed; ②avoid the gate directly hitting the cavity; ③increase melt temperature to improve flow front quality; after adjustment, continuously sample to verify the effect, and resume mass production only after confirming stability
Key Takeaway
HDPE flow marks and jetting are two extremes of speed; medium speed plus gate optimization is the balanced solution; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence
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